| Biosorption of clofibric acid and carbamazepine in aqueous solution by agricultural waste rice straw |
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| 作者姓名： | Zhanguang Liu Xuefei Zhou Xiaohua Chen Chaomeng Dai Juan Zhang Yalei Zhang |
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| 作者单位： | Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China |
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| 基金项目： | This study was financially supported by the National Key Technologies R&D Program (No. 2012BAJ25B04), the National Natural Science Foundation of China (No. 41072172, 51138009, 41101480, 21246001), the State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRY11004) and the New Century Excellent Talents in University (No. NCET-11-0391) and Tongji University Excellent Young Talents Training Fund. |
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| 摘 要： | Due to their widespread use, clofibric acid （CA） and carbamazepine （CBZ） have been frequently detected simultaneously at relatively high concentrations in aquatic environments. In this study, agricultural waste rice straw was employed as a potentially low-cost, effective and easy-to-operate biosorbent （RSB） to remove CA and CBZ. The adsorption of both pharmaceuticals followed pseudo second-order kinetics, and intraparticle diffusion was an important rate-limiting step. The adsorption isotherms of both drugs were fit well with Freundlich model. The adsorption of CA onto RSB was exothermic and was more likely to be dominated by physical processes, while the adsorption of CBZ was endothermic. Solution pH was determined to be the most important factor for CA adsorption, such that the adsorption capacity of CA onto RSB increased with the decline of solution pH. In the lower range of solution pH below 3. l, the CA removal efficiency was enhanced with the increase of biosorbent dosage. The CBZ removal efficiency was enhanced with the increase of RSB dosage without pH control. The maximum adsorption capacities were 126.3 mg/g for CA and 40.0 mg/g for CBZ.
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| 关 键 词： | 生物吸附剂 农业废弃物 卡马西平 Freundlich模型 液氯 溶液pH值 水溶 秸秆 |
| 收稿时间： | 19 February 2013 |
| 修稿时间： | 19 April 2013 |
Biosorption of clofibric acid and carbamazepine in aqueous solution by agricultural waste rice straw |
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| Zhanguang Liu,Xuefei Zhou,Xiaohua Chen,Chaomeng Dai,Juan Zhang,Yalei Zhang.Biosorption of clofibric acid and carbamazepine in aqueous solution by agricultural waste rice straw[J].Journal of Environmental Sciences,2013,25(12):2384-2395. |
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| Authors: | Zhanguang Liu Xuefei Zhou Xiaohua Chen Chaomeng Dai Juan Zhang and Yalei Zhang |
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| Institution: | Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China |
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| Abstract: | Due to their widespread use, clofibric acid (CA) and carbamazepine (CBZ) have been frequently detected simultaneously at relatively high concentrations in aquatic environments. In this study, agricultural waste rice straw was employed as a potentially low-cost, effective and easy-to-operate biosorbent (RSB) to remove CA and CBZ. The adsorption of both pharmaceuticals followed pseudo second-order kinetics, and intraparticle diffusion was an important rate-limiting step. The adsorption isotherms of both drugs were fit well with Freundlich model. The adsorption of CA onto RSB was exothermic and was more likely to be dominated by physical processes, while the adsorption of CBZ was endothermic. Solution pH was determined to be the most important factor for CA adsorption, such that the adsorption capacity of CA onto RSB increased with the decline of solution pH. In the lower range of solution pH below 3.1, the CA removal efficiency was enhanced with the increase of biosorbent dosage. The CBZ removal efficiency was enhanced with the increase of RSB dosage without pH control. The maximum adsorption capacities were 126.3 mg/g for CA and 40.0 mg/g for CBZ. |
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| Keywords: | biosorption clofibric acid carbamazepine rice straw agricultural waste uniform design |
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